If you’re all about neon color, fun geometrical shapes, and 1980s pop culture, then you are going to be floored by Sasha Bikoff’s latest design experience. The interior designer is the mastermind behind the show-stopping and electrifying stairwell at this year’s 46th Annual Kips Bay Decorator Show House, a stylish event in New York City that benefits the Kips Bay Boys & Girls Club’s after-school programs.